Esco Electrical Test Exam Questions with 100% Correct Answers 2024, Exams of Electrical Engineering

Download Esco Electrical Test Exam Questions with 100% Correct Answers 2024 and more Exams Electrical Engineering in PDF only on Docsity! Esco Electrical Test Exam Questions with 100% Correct Answers 2024. What is current flow? - Correct answer Dither flow of electrons in a circuit What is impedance? - Correct answer A.Opposition to alternating current Like charges will - Correct answer Repel each other Any material that will readily release electrons is called: - Correct answer B.A conductor The symbol for current is: - Correct answer B. I Electricity can produce: - Correct answer D. All the above Light Heat Magnetism The safety ground conductor is usually colored: - Correct answer Breen An electron has: - Correct answer B.A negative charge Which of the following materials would be best suited for use as a semi- conductor? - Correct answer Silicon Which of the following meters must use internal power to check a load or circuit? - Correct answer A.Ohmmeter What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm control relay? - Correct answer Bony the control relay would operate Three defrost heaters, each 15 ohms, are wired in parallel to a 120 volt power supply. How many Watts are consumed? - Correct answer C. 2880 When testing a capacitor with an analog or digital ohmmeter, the meter should: - Correct answer Measure low resistance then return to a high reading How much resistance must be placed in a 120 volt circuit to limit the current to 2 amps? - Correct answer A.60 ohms What is resistance? - Correct answer A.Opposition to electron flow In electrical wiring, a black colored wire indicates: - Correct answer A. A hot conductor How many watts are used by a heater operating on 460 volts and drawing 5 amps? - Correct answer D .2300 P a g e 1 | 6 How are fuses sized? - Correct answer D .Both A and B What is generally considered the maximum allowable supply voltage variation - Correct answer A.5%? Capacitors are rated in: - Correct answer D .Both B and C What is the term used to describe the output side of a transformer? - Correct answer D .Secondary side One horsepower is equal to ______ watts. - Correct answer B. 746 A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? - Correct answer A.6 ohms In a series circuit, the voltage drop across each load will: - Correct answer D .Add up to equal the source voltage Which of the following is equal to 2.1kW? - Correct answer c .2100 watts A capacitor analyzer is designed to check: - Correct answer D .The capacitance of the capacitor On an electronic oil safety switch, what changes the pressure signal to an electrical signal? - Correct answer A.Transducer A three phase load requires a minimum of - Correct answer A.Three supply lines An electronically commutated motor (ECM) is designed to: - Correct answer D .Provide proper airflow under various conditions Resistance can be calculated by: - Correct answer A.E divided by I The total resistance in a parallel circuit will be: - Correct answer D .Less than the smallest resistance Which of the following statements about current is true? - Correct answer Current flow will increase when voltage increases When resistors are wired parallel: - Correct answer B.Th. voltage drop across each resistor will be the same as the applied source voltage Which of the following is equal to 100 milliamps? - Correct answer C. 0.10 amps The meter on a house measures the ____ passing through it. - Correct answer C. Watts What is the correct formula for determining wattage? - Correct answer A.W = E x I P a g e 2 | 6 On a good single phase compressor, which winding terminals have the highest resistance? - Correct answer Arum to start When testing a motor with an ohmmeter, the following measurements are recorded; C to R = 4, C to S = 6.2, or to S = 10.2, or to ground = 20.4. This indicates: - Correct answer B. A grounded condition With a motor running at full load, voltmeter leads are placed on L1 and T1 with no measurable voltage detected. This indicates: - Correct answer C. Good, clean contacts When the temperature of a negative temperature coefficient (NTC) thermistor increases, its resistance: - Correct answer B. Decreases When the temperature of a positive temperature coefficient (PTC) thermistor increases, its resistance: - Correct answer A.Increases The most common type of transducer used with HVAC/R equipment creates a signal based on: - Correct answer D. Pressure A thermocouple can: - Correct answer C. Generate a small DC current To discharge a capacitor: - Correct answer B. Use a 15,000 to 20,000 ohm, 2 to 5 watt resistor across the terminals Which of the following is an acceptable temporary replacement capacitor for a 35MFD, 440VAC capacitor? - Correct answer D. 37.5MFD, 440VAC When checking the windings on a three phase motor, the resistance readings should: - Correct answer C. All read the same Capacitors are always connected _____ with the start winding? - Correct answer A. In series The symbol for a heating thermostat is represented by: - Correct answer C. The symbol for a pressure switch that closes on a rise of pressure is represented by: - Correct answer B. The symbol for a pressure switch that opens on a rise in pressure is represented by: - Correct answer D. The synchronous speed of a four pole, 60 Hz single phase motor is: - Correct answer D. 1800 RPM The symbol for a transformer is: - Correct answer C. The symbol for a thermal overload is: - Correct answer D. The symbol for a pressure switch is - Correct answer A. P a g e 5 | 6 The symbol for a thermostatic switch is: - Correct answer B. IN the schematic, what voltage would be found across l1 to l2? - Correct answer A. 240 volts IN the schematic, (during operation) what voltage would be found across the condenser fan motor? - Correct answer A. 240 volts IN the schematic, (during operation) what voltage would be found across the transformer primary - Correct answer B. 240 volts? In the schematic, what voltage would be found from terminal G to the load side of the transformer? (Assume the thermostat is in the closed position and the fan is set to auto.) - Correct answer B. 24 volts In the schematic, what voltage would be found (during operation) across the contacts when energized in line #8? (Assume the thermostat is in the closed position and the fan is set to auto.) - Correct answer B. 0 volts Inez the schematic, what voltage would be found from terminal Y to the input side of the coil on the line #11? (Assume the thermostat is in the closed position and the fan is set to auto.) - Correct answer A. 0 volts When troubleshooting an A/C system in the schematic, the following conditions are found. The thermostat contacts are closed. The compressor and the condenser fan motor are short cycling. The blower motor is not running. This could be caused by? - Correct answer C. Faulty blower motor or blower relay When troubleshooting an A/C system in the schematic, the following conditions are found. The thermostat contacts are closed. The compressor and the condenser fan motor are not running. The blower motor is running. This could be caused by? - Correct answer C. the hp, LP, overloads, oil pressure switch are open Correct answer C. a faulty thermostat- auto / fan on switch In the schematic, the crankcase heater will operate; - Correct answer C. when the compressor is off IN the schematic, the coil on line # 11 does not control; - Correct answer D. the blower motor P a g e 6 | 6